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V. retifera, 

 anomala, 

 galactites, 

 exilis, 

 scalarina, 

 Scotica, 

 aurea, 

 virginea, 

 marmorata, 

 ovulea, 

 laterisulca, 

 callipyga, 



V. opima, 



' nebulosa, 



' phaseolina, 



' carneola, 



' florida, 



' petalina, 



' bicolor, 



' floridella, 



' catenifera, 



' pulchella, 



' sinuosa, 



' tristis, 



V. rimularis, 



' vulvina, 



' vermiculosa, 



' flammiculata, 



' conularis, 



' strigosa, 



' aphrodina, 



' Peronii, 



' aphrodinoides, 



' elegantina, 



' flammea, 



' undulosa, 



V. pumila, 

 ' ovata, 

 ' inquinata, 

 ' lamellata, 

 ' Berii, 

 ' elegans, 

 ' Skutchburii, 

 ' papyracea, 

 ' aurisiaca, 

 ' costulata, 



G fossil species. 



Venericardia. Shell equivalve, inequilateral, suborbicular, mostly with 

 longitudinal, radiating ribs. Two oblique cardinal teeth, standing the same 

 way. 



V. australis, V. Tankervillii, V. crassicosta, 10 fossil species. 



1 flammea, (N. S.) 



CARDIACEA.— Five Genera. 



Cardinal teeth irregular, either in their form or in their situation; and in 

 general accompanied by one or two lateral teeth. 



Cardium. Shell equivalve, rather heart-shaped; the beaks prominent; 

 the internal margins of the valves dentated or plaited; hinge with four teeth in 

 each valve; the two cardinal approximate and oblique, articulating cross- 

 wise with the two in the other valve; and two rather distant, entering, lateral 

 teeth. 



, costatum, 

 Indicum, 

 ringens, 

 Asiaticum, 

 tenuicostatum, 

 fimbriatum, 

 Brasilianum, 

 apertum, 

 papyraceum, 

 bullatum, 

 ciliare, 

 echinatum, 

 pseudolinia, 



C. aculeatum, 

 erinaceum, 

 tuberculatum, 

 isocardia, 

 muricatum, 

 angulatum, 

 marmoreum, 

 elongatum, 

 ventricosum, 

 rugosum, 

 sulcatum, 

 serratum, 



, lsevigatum, 

 biradiatum, 

 aeolicum, 

 pectinatum, 

 rusticum, 

 edule, 



Groenlandicum, 

 latum, 

 crenulatum, 

 exiguum, 

 minutum, 

 roseum, 



C. scobinatum, 



' unedo, 



' medium, 



' fragum, 



' retusum, 



' tumoriferum, 



' hemicardium, 



' cardissa, 



' inversum, 



' Junonise, 



' lineatum, 

 14 fossil species. 



Cardita. Shell free, regular, equivalve, inequilateral; hinge with two 



